Metal mold



July 29, 1947.

AM. c. JAY 2,424,931

METAL MOLD v Filed Dec. 26, 1942 f ll Il ll l #VA INVENTOR: Marr/EW 6 Jax *W @Ma Patented July 29, 1947 UiTED s'rAi-'Es PATENT .OFFICE Matthew C. Jay, Gary; Ind. Application December 26, 1942, Serial No. 470,255

This invention relates to improvements in metal molds for casting metal at high temperatures.

Molds for casting test pieces or specimens of A heats of steel have been employed heretofore made of what is generally termed Swedish steel. the prime requisites of such a mold being' the repeated casting of specimens of uniform dimension at high temperatures of from 2600 F. to 3200 F. without fusion with the mold. While such yprior molds have been successfully employed, theirl span of life is too short; they suffer rapid oxidation; frequently become spotted by alloy metals; and do not permit of water quenching for quick cooling. I

It is a prime object of my invention to provide a mold of the character stated composed of a metal which will obviate the objections heretofore stated, and whichmay be produced and used with a considerable saving in cost.

Additional objects and advantages will become apparent from the following description taken in connection with the accompanying drawing which illustrates a mold of the character referred to and embodying the present invention.

As illustrated, the mold may comprise halves or separable complemental sections A, each having an elongate half-cylindrical mold cavity 2 combining to mold a test piece of cast metal of a desired length and crosssectional area to serve in resistance testing for carbon content in suitable apparatus generally employed in the art for such test. The cavities 2 have complemental y sprue portions 3 extending to one outer face of the moldto receive the molten metal.

The mold A is machined to substantially the size and contour, formerly employed for such molds, from a killed i. e., substantially completely deoxidized, steel containing not more than 0.12 carbon and not more than 0.25 copper. I have found the following compositions and range to produce satisfactory results:

Example Example I n Range 0. 12 0. 11 0.05 to 0.12 0. 40 0.40 0.30 t0 0.60 0. 010 0. to 0.10 maximum 0. 037 0. 037 t0 0.04 m um 0. 08 0. 08 0.10 and under 0. 24 0. 24 0.25 and under 0. 03 O. 03

so long as the end product contains carbon and copper within the speciiied range above.V

A mold having the foregoing composition possesses the ability to withstand high temperatures` y by quenching of the mold in water.

The metal from which the mold is formed is sufilciently soft to be `readily machined, and undergoes minimum oxidation, even despite the water quenching, thereby preventing injury to the cast specimens, as by spotting. The life of such a mold in service has been found to be more than three times that of the former Swedish steel molds, and may be produced at considerably lower cost.

Various changes and modifications are contemplated within the scope of the following claims.

I claim:

l. A test mold for casting metal test pieces composed of a killed low carbon steel containing copper in effective amounts but not exceeding 0.25, said mold having the characteristics of preventing fusion with the molten metal cast therein at temperatures up to substantially 3000 F., and

of effectively resisting spotting upon subsequently being quenched in water.

2. A test mold for casting metal test pieces composed of a. killed low carbon steel containing from about 0.05 to 0.12 carbon, 0.30 to 0.60 manganese, copper in effective amounts but not exceeding 0.25, phosphorus not to exceed 0.10, sulphur not to exceed 0.04, silicon not to exceed 0.10, with the balance being substantially pure iron, said mold having the characteristics of preventing fusion with the molten metal cast therein at temperatures up to substantially 3000 F., and of effectively resisting spotting upon subsequently beingquenched in water.

MA'i'rHEW c. JAY.

REFERENCES CITED The following, references are of record in the le of this patent:

UNITED STATES PATENTS Number Name l Date 1.191.473 Robinson July 18, 1916 2,132,276 Spalding Oct. 4, 1938 OTHER REFERENCES 

